Abstract
A transient study of bandpass (BP) negative group delay (NGD) function is devoted in this paper. The transient analysis is applied to an original topology of NGD barcode-shape microstrip circuit. The performed investigation explains how to realize the transient analysis of tri-band NGD circuit. The time-domain (TD) parametrization of the test is established from the BP-NGD specifications of the circuit under test (CUT) based on the S-parameter model. The input signal is a Gaussian pulse characterized in function of the NGD bandwidth (BW) and center frequency. The feasibility of the BP-NGD transient study is illustrated with experimentation based on ultra-wide band (UWB) pulse generator. As proof-of-concept, barcode NGD circuit exhibiting tri-band NGD value-center frequency-bandwidth, (−5.9 ns, 2.128 GHz, 20 MHz), (−7.4 ns, 2.3 GHz, 14 MHz) and (−4.8 ns, 2.42 GHz, 14 MHz) has been fabricated and tested. The transient simulations and experiences confirm that the output signal envelopes of the barcode NGD prototype present leading and tailing edges in time-advance of input ones when the carrier frequency is set equal to the NGD center frequency.
Highlights
The time-domain (TD) analysis [1,2,3] is one of strategic approaches of radio frequency (RF) and microwave communication system and components
An innovative transient study of RF and microwave circuit operating with bandpass (BP) negative group delay (NGD) function is devoted in this paper
To realize the transient analysis, we have considered a Gaussian pulse as input signal in order to analytically define the TD characteristics in function of the NGD bandwidth (BW) and center frequency
Summary
The time-domain (TD) analysis [1,2,3] is one of strategic approaches of radio frequency (RF) and microwave communication system and components. The interpretation of the unfamiliar NGD function remains, so far, an open question to most of microwave design and fabrication engineers. This intriguing function was investigated theoretically and experimentally with different topologies [26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44] of microwave circuits. Few research works are available for the TD analysis of BP-NGD circuit For this reason, the present paper is oriented to the transient analysis of unfamiliar BP-NGD function. The BP-NGD signature is explained with TD measurement based on the comparison of modulated pulse signal envelopes. Section V concludes the paper
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